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parser/Cargo.toml

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+[package]
+name = "parser"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+strum = "0.27.1"
+strum_macros = "0.27.1"
+winnow = "0.7.11"

parser/README.md

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+# Parser library
+This is a parser for the BMS file format.
+Right now its goal is correctness of behaviour for what our _users_ expect as
+opposed to what the informal specs say.
+
+This means we will inherit defaults from the most popular players such as LR2.
+
+## Resources
+[BMS command memo by hitkey](https://hitkey.bms.ms/cmds.htm) was invaluable when
+writing this. Whilst it's rough around the edges from machine translation it's
+one of the most thorough English-language documents detailing the BMS spec.

parser/src/header.rs

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+struct Header {
+    player: Player,
+}
+
+/// Defines the play side.
+#[derive(FromRepr, Debug, PartialEq, Clone)]
+#[repr(u8)]
+enum Player {
+    One,   // SP
+    Two,   // Couple play
+    Three, // DP
+    Four,  // Battle Play. This is very, very rare
+}
+
+impl Default for Player {
+    fn default() -> Self {
+        Self::One
+    }
+}

parser/src/lib.rs

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+pub fn add(left: u64, right: u64) -> u64 {
+    left + right
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}